/*
 * Copyright (C) 2017 ~ 2025 the original author or authors.
 * <James Wong@gmail.com, 983708408@qq.com> Technology CO.LTD.
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * Reference to website: http://wl4g.com
 */
package com.wl4g.infra.integration.feign.core.context;

import java.util.Map;
import java.util.TreeMap;

import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;

/**
 * Default springboot-feign {@link RpcContextHolder} auto configuration. (Both
 * the consumer side and the production side should be configured)
 * 
 * @author James Wong &lt;jameswong1376@gmail.com&gt;
 * @version v1.0 2021-01-01
 * @sine v1.0
 * @see
 */
public class DefaultFeignContextAutoConfiguration {

    @Bean
    @ConditionalOnMissingBean(RpcContextHolder.class) // Lower priority
    public RpcContextHolder defaultFeignRpcContextHolder() {
        return new DefaultFeignRpcContextHolder();
    }

    public static class DefaultFeignRpcContextHolder extends RpcContextHolder {

        private static final ThreadLocal<DefaultFeignRpcContextHolder> LOCAL = new InheritableThreadLocal<DefaultFeignRpcContextHolder>() {
            @Override
            protected DefaultFeignRpcContextHolder initialValue() {
                return new DefaultFeignRpcContextHolder();
            }
        };

        private static final ThreadLocal<DefaultFeignRpcContextHolder> SERVER_LOCAL = new InheritableThreadLocal<DefaultFeignRpcContextHolder>() {
            @Override
            protected DefaultFeignRpcContextHolder initialValue() {
                return new DefaultFeignRpcContextHolder();
            }
        };

        // Notes: Since feignclient ignores case when setting header, it should
        // be unified here.

        /**
         * Feign request context attachments store. Thread isolation, thread
         * safety
         */
        private final Map<String, String> attachments = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);

        @Override
        public String getAttachment(String key) {
            return attachments.get(key);
        }

        @Override
        public Map<String, String> getAttachments() {
            return attachments;
        }

        @Override
        public void setAttachment(String key, String value) {
            attachments.put(key, value);
        }

        @Override
        public void removeAttachment(String key) {
            attachments.remove(key);
        }

        @Override
        public void clearAttachments() {
            attachments.clear();
        }

        @Override
        protected RpcContextHolder getContext0() {
            return LOCAL.get();
        }

        @Override
        protected RpcContextHolder getServerContext0() {
            return SERVER_LOCAL.get();
        }

        @Override
        protected void removeContext0() {
            LOCAL.remove();
        }

        @Override
        protected void removeServerContext0() {
            SERVER_LOCAL.remove();
        }
    }

}
